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Retirement benefits (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Schedule of components of net periodic benefit cost for consolidated HEI
The components of NPPC and NPBC for HEI consolidated and Hawaiian Electric consolidated were as follows:
 
 
Three months ended June 30
 
Six months ended June 30
 
 
Pension benefits
 
Other benefits
 
Pension benefits
 
Other benefits
(in thousands)
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
HEI consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
17,428

 
$
15,870

 
$
692

 
$
847

 
$
34,541

 
$
32,364

 
$
1,361

 
$
1,687

Interest cost
 
19,459

 
20,361

 
2,030

 
2,315

 
38,693

 
40,577

 
3,961

 
4,726

Expected return on plan assets
 
(27,224
)
 
(25,646
)
 
(3,267
)
 
(3,104
)
 
(54,478
)
 
(51,367
)
 
(6,459
)
 
(6,170
)
Amortization of net prior service gain
 
(11
)
 
(13
)
 
(451
)
 
(448
)
 
(21
)
 
(27
)
 
(903
)
 
(897
)
Amortization of net actuarial loss
 
7,634

 
6,707

 
48

 
199

 
15,029

 
13,220

 
46

 
565

Net periodic pension/benefit cost (return)
 
17,286

 
17,279

 
(948
)
 
(191
)
 
33,764

 
34,767

 
(1,994
)
 
(89
)
Impact of PUC D&Os
 
7,179

 
(4,867
)
 
1,024

 
527

 
9,836

 
(10,023
)
 
2,095

 
673

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
24,465

 
$
12,412

 
$
76

 
$
336

 
$
43,600

 
$
24,744

 
$
101

 
$
584

Hawaiian Electric consolidated
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Service cost
 
$
17,007

 
$
15,436

 
$
688

 
$
841

 
$
33,680

 
$
31,530

 
$
1,352

 
$
1,676

Interest cost
 
17,937

 
18,726

 
1,955

 
2,231

 
35,647

 
37,315

 
3,814

 
4,558

Expected return on plan assets
 
(25,577
)
 
(23,935
)
 
(3,216
)
 
(3,056
)
 
(51,184
)
 
(47,946
)
 
(6,356
)
 
(6,073
)
Amortization of net prior service loss (gain)
 
2

 
2

 
(451
)
 
(451
)
 
4

 
4

 
(902
)
 
(902
)
Amortization of net actuarial loss
 
6,941

 
6,190

 
49

 
192

 
13,651

 
12,196

 
49

 
551

Net periodic pension/benefit cost (return)
 
16,310

 
16,419

 
(975
)
 
(243
)
 
31,798

 
33,099

 
(2,043
)
 
(190
)
Impact of PUC D&Os
 
7,179

 
(4,867
)
 
1,024

 
527

 
9,836

 
(10,023
)
 
2,095

 
673

Net periodic pension/benefit cost (adjusted for impact of PUC D&Os)
 
$
23,489

 
$
11,552

 
$
49

 
$
284

 
$
41,634

 
$
23,076

 
$
52

 
$
483